Cellulose-ether composition



Patented Sept. 4, 1923.

UNITED STATES PATENT, o1=1=1c STEWART J'. CARROLL, OF ROCHESTER, NEW YORK, ASSIGNOR TO EASTMAN KODAK COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

CELLULOSE-ETHER COMPOSITION.

30 Drawing.

To all whom it may concern:

Be it known that I, STEWART J. CARROLL, a citizen of the United States of America, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Cellulose-Ether Compositions, of which the following is a full, clear, and exact specification.

This invention relates to new compositions of matter in which cellulose ethers are mixed with other substances so that they can be advantageously used in theplastic and analogous arts, such, for example, as sheet or film or varnish manufacture.

One object of my invention is to provide compositions of increased utility in the plastic and analogous arts. Another object my invention is to provide compositions which may be made into strong, flexible, I

transparent films, Further objects will have discovered moulded articles, etc. hereinafter appear.

that a composition of matter having these desired characteristics can be obtained by mixing or compounding cellulose ether, say of the type indicated in U. S Patent 1,188,376,, Lilienfeld, June 20, 1916, with cyclohexanone. In the preferred forms of my invention I ma add one or more of the following alky compounds: monohydroxy aliphatic alcohols of less than six carbon atoms, the acetates of such alcohols, acetone. While cyclohexanone, by itself, is a useful solvent for film making I prefer to use with it, one or more volatile vehicles to carry the ingredients and control evaporation, such as ethyl alcohol, methyl alcohol, ethyl acetate, methyl acetate, acetone.

By way of illustration, I may dissolve cellulose ether, like water-insoluble ethyl cellulose, in cyclohexanone,

weightof the ether to from 4 to 6 parts of cellulose ether,

sayone part by Application filed March 3, 1922. Serial No. 540,859.

the solvent. I prefer, however, to use from 90 to 10 parts of cyclohexanone mixed with from 10 to 90 parts of said alkyl compounds, such as methyl acetate. For instance, an excellent viscous film-making dope is pre ared by dissolving one part by weight 0 said ethyl cellulose in from 4 to 6 (say 5) parts of a mixed solvent containing cyclohexanone and methyl acetate in equal proportions.

Other substances which impart useful qualities to the film may be added, if desired,

such as triphenyl or tricresyl phosphate,

camphor, monochlornaphthalene, etc. The ingredients are of the commercial type, sufficiently purified for the purposein view. For film dopes they are prepared to yield films of the proper relative freedom from color.

Having thus described my invention, what claim as new and desire to secure by Letters Patent is:

-l. A composition of matter comprising cellulose ether and cyclohexanone. "2. A composition of matter, comprising cellulose ether dissolved in cyclohexanone and a volatile vehicle carrying said ether and said cyclohexanone.

3. A composition of matter comprising cyclohexanone and methyl acetate.-

4. A -composition of matter comprising cellulose ether dissolved in a mixture containing from 90 to 10 parts by weight of cyclohe-xanone and 10 to 90 parts of a volatile vehicle carrying said ingredients.

5. A viscous flowable composition comprising one part by weight of water-insoluble ethyl cellulose, and from 4 to 6 parts of a solvent containing cyclohexanone.

Signed at Rochester, New York, this 27 day of February, 1922.

STEWART J. CARROLL. 

